Remove unused V8 integration code in Sky

sky/engine/bindings/scripts/idl_definitions.py

Index: sky/engine/bindings/scripts/idl_definitions.py
diff --git a/sky/engine/bindings/scripts/idl_definitions.py b/sky/engine/bindings/scripts/idl_definitions.py
deleted file mode 100644
index 51cecee974e5a08474cf4b06f9b27d8161fcce4b..0000000000000000000000000000000000000000
--- a/sky/engine/bindings/scripts/idl_definitions.py
+++ /dev/null
@@ -1,826 +0,0 @@
-# Copyright (C) 2013 Google Inc. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Blink IDL Intermediate Representation (IR) classes.
-
-Classes are primarily constructors, which build an IdlDefinitions object
-(and various contained objects) from an AST (produced by blink_idl_parser).
-
-This is in two steps:
-* Constructors walk the AST, creating objects.
-* Typedef resolution.
-
-Typedefs are all resolved here, and not stored in IR.
-
-Typedef resolution uses some auxiliary classes and OOP techniques to make this
-a generic call, via the resolve_typedefs() method.
-
-Class hierarchy (mostly containment, '<' for inheritance):
-
-IdlDefinitions
-    IdlCallbackFunction < TypedObject
-    IdlEnum :: FIXME: remove, just use a dict for enums
-    IdlInterface
-        IdlAttribute < TypedObject
-        IdlConstant < TypedObject
-        IdlLiteral
-        IdlOperation < TypedObject
-            IdlArgument < TypedObject
-        IdlStringifier
-    IdlException < IdlInterface
-        (same contents as IdlInterface)
-
-TypedObject :: mixin for typedef resolution
-
-Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
-"""
-
-import abc
-
-from idl_types import IdlType, IdlUnionType, IdlArrayType, IdlSequenceType, IdlNullableType
-
-SPECIAL_KEYWORD_LIST = ['GETTER', 'SETTER', 'DELETER']
-STANDARD_TYPEDEFS = {
-    # http://www.w3.org/TR/WebIDL/#common-DOMTimeStamp
-    'DOMTimeStamp': 'unsigned long long',
-}
-
-
-################################################################################
-# TypedObject (mixin for typedef resolution)
-################################################################################
-
-class TypedObject(object):
-    """Object with a type, such as an Attribute or Operation (return value).
-
-    The type can be an actual type, or can be a typedef, which must be resolved
-    before passing data to the code generator.
-    """
-    __metaclass__ = abc.ABCMeta
-    idl_type = None
-
-    def resolve_typedefs(self, typedefs):
-        """Resolve typedefs to actual types in the object."""
-        # Constructors don't have their own return type, because it's the
-        # interface itself.
-        if not self.idl_type:
-            return
-        # Need to re-assign self.idl_type, not just mutate idl_type,
-        # since type(idl_type) may change.
-        self.idl_type = self.idl_type.resolve_typedefs(typedefs)
-
-
-################################################################################
-# Definitions (main container class)
-################################################################################
-
-class IdlDefinitions(object):
-    def __init__(self, idl_name, node):
-        """Args: node: AST root node, class == 'File'"""
-        self.callback_functions = {}
-        self.dictionaries = {}
-        self.enumerations = {}
-        self.interfaces = {}
-        self.idl_name = idl_name
-
-        node_class = node.GetClass()
-        if node_class != 'File':
-            raise ValueError('Unrecognized node class: %s' % node_class)
-
-        typedefs = dict((typedef_name, IdlType(type_name))
-                        for typedef_name, type_name in
-                        STANDARD_TYPEDEFS.iteritems())
-
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Interface':
-                interface = IdlInterface(idl_name, child)
-                self.interfaces[interface.name] = interface
-            elif child_class == 'Exception':
-                exception = IdlException(idl_name, child)
-                # For simplicity, treat exceptions as interfaces
-                self.interfaces[exception.name] = exception
-            elif child_class == 'Typedef':
-                type_name = child.GetName()
-                typedefs[type_name] = typedef_node_to_type(child)
-            elif child_class == 'Enum':
-                enumeration = IdlEnum(idl_name, child)
-                self.enumerations[enumeration.name] = enumeration
-            elif child_class == 'Callback':
-                callback_function = IdlCallbackFunction(idl_name, child)
-                self.callback_functions[callback_function.name] = callback_function
-            elif child_class == 'Implements':
-                # Implements is handled at the interface merging step
-                pass
-            elif child_class == 'Dictionary':
-                dictionary = IdlDictionary(idl_name, child)
-                self.dictionaries[dictionary.name] = dictionary
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-        # Typedefs are not stored in IR:
-        # Resolve typedefs with the actual types and then discard the Typedefs.
-        # http://www.w3.org/TR/WebIDL/#idl-typedefs
-        self.resolve_typedefs(typedefs)
-
-    def resolve_typedefs(self, typedefs):
-        for callback_function in self.callback_functions.itervalues():
-            callback_function.resolve_typedefs(typedefs)
-        for interface in self.interfaces.itervalues():
-            interface.resolve_typedefs(typedefs)
-
-    def update(self, other):
-        """Update with additional IdlDefinitions."""
-        for interface_name, new_interface in other.interfaces.iteritems():
-            if not new_interface.is_partial:
-                # Add as new interface
-                self.interfaces[interface_name] = new_interface
-                continue
-
-            # Merge partial to existing interface
-            try:
-                self.interfaces[interface_name].merge(new_interface)
-            except KeyError:
-                raise Exception('Tried to merge partial interface for {0}, '
-                                'but no existing interface by that name'
-                                .format(interface_name))
-
-            # Merge callbacks and enumerations
-            self.enumerations.update(other.enumerations)
-            self.callback_functions.update(other.callback_functions)
-
-
-################################################################################
-# Callback Functions
-################################################################################
-
-class IdlCallbackFunction(TypedObject):
-    def __init__(self, idl_name, node):
-        children = node.GetChildren()
-        num_children = len(children)
-        if num_children != 2:
-            raise ValueError('Expected 2 children, got %s' % num_children)
-        type_node, arguments_node = children
-        arguments_node_class = arguments_node.GetClass()
-        if arguments_node_class != 'Arguments':
-            raise ValueError('Expected Arguments node, got %s' % arguments_node_class)
-
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        self.idl_type = type_node_to_type(type_node)
-        self.arguments = arguments_node_to_arguments(idl_name, arguments_node)
-
-    def resolve_typedefs(self, typedefs):
-        TypedObject.resolve_typedefs(self, typedefs)
-        for argument in self.arguments:
-            argument.resolve_typedefs(typedefs)
-
-
-################################################################################
-# Dictionary
-################################################################################
-
-class IdlDictionary(object):
-    def __init__(self, idl_name, node):
-        self.extended_attributes = {}
-        self.is_partial = node.GetProperty('Partial') or False
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        self.members = []
-        self.parent = None
-        for child in node.GetChildren():
-            child_class = child.GetClass()
-            if child_class == 'Inherit':
-                self.parent = child.GetName()
-            elif child_class == 'Key':
-                self.members.append(IdlDictionaryMember(idl_name, child))
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = (
-                    ext_attributes_node_to_extended_attributes(idl_name, child))
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-
-class IdlDictionaryMember(object):
-    def __init__(self, idl_name, node):
-        self.default_value = None
-        self.extended_attributes = {}
-        self.idl_type = None
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        for child in node.GetChildren():
-            child_class = child.GetClass()
-            if child_class == 'Type':
-                self.idl_type = type_node_to_type(child)
-            elif child_class == 'Default':
-                self.default_value = default_node_to_idl_literal(child)
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = (
-                    ext_attributes_node_to_extended_attributes(idl_name, child))
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-
-################################################################################
-# Enumerations
-################################################################################
-
-class IdlEnum(object):
-    # FIXME: remove, just treat enums as a dictionary
-    def __init__(self, idl_name, node):
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        self.values = []
-        for child in node.GetChildren():
-            self.values.append(child.GetName())
-
-
-################################################################################
-# Interfaces and Exceptions
-################################################################################
-
-class IdlInterface(object):
-    def __init__(self, idl_name, node=None):
-        self.attributes = []
-        self.constants = []
-        self.constructors = []
-        self.custom_constructors = []
-        self.extended_attributes = {}
-        self.operations = []
-        self.parent = None
-        self.stringifier = None
-        if not node:  # Early exit for IdlException.__init__
-            return
-
-        self.is_callback = node.GetProperty('CALLBACK') or False
-        self.is_exception = False
-        # FIXME: uppercase 'Partial' => 'PARTIAL' in base IDL parser
-        self.is_partial = node.GetProperty('Partial') or False
-        self.idl_name = idl_name
-        self.name = node.GetName()
-
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Attribute':
-                self.attributes.append(IdlAttribute(idl_name, child))
-            elif child_class == 'Const':
-                self.constants.append(IdlConstant(idl_name, child))
-            elif child_class == 'ExtAttributes':
-                extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-                self.constructors, self.custom_constructors = (
-                    extended_attributes_to_constructors(idl_name, extended_attributes))
-                clear_constructor_attributes(extended_attributes)
-                self.extended_attributes = extended_attributes
-            elif child_class == 'Operation':
-                self.operations.append(IdlOperation(idl_name, child))
-            elif child_class == 'Inherit':
-                self.parent = child.GetName()
-            elif child_class == 'Stringifier':
-                self.stringifier = IdlStringifier(idl_name, child)
-                self.process_stringifier()
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-    def resolve_typedefs(self, typedefs):
-        for attribute in self.attributes:
-            attribute.resolve_typedefs(typedefs)
-        for constant in self.constants:
-            constant.resolve_typedefs(typedefs)
-        for constructor in self.constructors:
-            constructor.resolve_typedefs(typedefs)
-        for custom_constructor in self.custom_constructors:
-            custom_constructor.resolve_typedefs(typedefs)
-        for operation in self.operations:
-            operation.resolve_typedefs(typedefs)
-
-    def process_stringifier(self):
-        """Add the stringifier's attribute or named operation child, if it has
-        one, as a regular attribute/operation of this interface."""
-        if self.stringifier.attribute:
-            self.attributes.append(self.stringifier.attribute)
-        elif self.stringifier.operation:
-            self.operations.append(self.stringifier.operation)
-
-    def merge(self, other):
-        """Merge in another interface's members (e.g., partial interface)"""
-        self.attributes.extend(other.attributes)
-        self.constants.extend(other.constants)
-        self.operations.extend(other.operations)
-
-
-class IdlException(IdlInterface):
-    # Properly exceptions and interfaces are distinct, and thus should inherit a
-    # common base class (say, "IdlExceptionOrInterface").
-    # However, there is only one exception (DOMException), and new exceptions
-    # are not expected. Thus it is easier to implement exceptions as a
-    # restricted subclass of interfaces.
-    # http://www.w3.org/TR/WebIDL/#idl-exceptions
-    def __init__(self, idl_name, node):
-        # Exceptions are similar to Interfaces, but simpler
-        IdlInterface.__init__(self, idl_name)
-        self.is_callback = False
-        self.is_exception = True
-        self.is_partial = False
-        self.idl_name = idl_name
-        self.name = node.GetName()
-
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Attribute':
-                attribute = IdlAttribute(idl_name, child)
-                self.attributes.append(attribute)
-            elif child_class == 'Const':
-                self.constants.append(IdlConstant(idl_name, child))
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-            elif child_class == 'ExceptionOperation':
-                self.operations.append(IdlOperation.from_exception_operation_node(idl_name, child))
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-
-################################################################################
-# Attributes
-################################################################################
-
-class IdlAttribute(TypedObject):
-    def __init__(self, idl_name, node):
-        self.is_read_only = node.GetProperty('READONLY') or False
-        self.is_static = node.GetProperty('STATIC') or False
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        # Defaults, overridden below
-        self.idl_type = None
-        self.extended_attributes = {}
-
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Type':
-                self.idl_type = type_node_to_type(child)
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-
-################################################################################
-# Constants
-################################################################################
-
-class IdlConstant(TypedObject):
-    def __init__(self, idl_name, node):
-        children = node.GetChildren()
-        num_children = len(children)
-        if num_children < 2 or num_children > 3:
-            raise ValueError('Expected 2 or 3 children, got %s' % num_children)
-        type_node = children[0]
-        value_node = children[1]
-        value_node_class = value_node.GetClass()
-        if value_node_class != 'Value':
-            raise ValueError('Expected Value node, got %s' % value_node_class)
-
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        # ConstType is more limited than Type, so subtree is smaller and
-        # we don't use the full type_node_to_type function.
-        self.idl_type = type_node_inner_to_type(type_node)
-        # FIXME: This code is unnecessarily complicated due to the rather
-        # inconsistent way the upstream IDL parser outputs default values.
-        # http://crbug.com/374178
-        if value_node.GetProperty('TYPE') == 'float':
-            self.value = value_node.GetProperty('VALUE')
-        else:
-            self.value = value_node.GetName()
-
-        if num_children == 3:
-            ext_attributes_node = children[2]
-            self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, ext_attributes_node)
-        else:
-            self.extended_attributes = {}
-
-
-################################################################################
-# Literals
-################################################################################
-
-class IdlLiteral(object):
-    def __init__(self, idl_type, value):
-        self.idl_type = idl_type
-        self.value = value
-        self.is_null = False
-
-    def __str__(self):
-        if self.idl_type == 'DOMString':
-            return 'String("%s")' % self.value
-        if self.idl_type == 'integer':
-            return '%d' % self.value
-        if self.idl_type == 'float':
-            return '%g' % self.value
-        if self.idl_type == 'boolean':
-            return 'true' if self.value else 'false'
-        raise ValueError('Unsupported literal type: %s' % self.idl_type)
-
-
-class IdlLiteralNull(IdlLiteral):
-    def __init__(self):
-        self.idl_type = 'NULL'
-        self.value = None
-        self.is_null = True
-
-    def __str__(self):
-        return 'nullptr'
-
-
-def default_node_to_idl_literal(node):
-    # FIXME: This code is unnecessarily complicated due to the rather
-    # inconsistent way the upstream IDL parser outputs default values.
-    # http://crbug.com/374178
-    idl_type = node.GetProperty('TYPE')
-    if idl_type == 'DOMString':
-        value = node.GetProperty('NAME')
-        if '"' in value or '\\' in value:
-            raise ValueError('Unsupported string value: %r' % value)
-        return IdlLiteral(idl_type, value)
-    if idl_type == 'integer':
-        return IdlLiteral(idl_type, int(node.GetProperty('NAME'), base=0))
-    if idl_type == 'float':
-        return IdlLiteral(idl_type, float(node.GetProperty('VALUE')))
-    if idl_type == 'boolean':
-        return IdlLiteral(idl_type, node.GetProperty('VALUE'))
-    if idl_type == 'NULL':
-        return IdlLiteralNull()
-    raise ValueError('Unrecognized default value type: %s' % idl_type)
-
-
-################################################################################
-# Operations
-################################################################################
-
-class IdlOperation(TypedObject):
-    def __init__(self, idl_name, node=None):
-        self.arguments = []
-        self.extended_attributes = {}
-        self.specials = []
-        self.is_constructor = False
-
-        if not node:
-            self.is_static = False
-            return
-        self.idl_name = idl_name
-        self.name = node.GetName()  # FIXME: should just be: or ''
-        # FIXME: AST should use None internally
-        if self.name == '_unnamed_':
-            self.name = ''
-
-        self.is_static = node.GetProperty('STATIC') or False
-        property_dictionary = node.GetProperties()
-        for special_keyword in SPECIAL_KEYWORD_LIST:
-            if special_keyword in property_dictionary:
-                self.specials.append(special_keyword.lower())
-
-        self.idl_type = None
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Arguments':
-                self.arguments = arguments_node_to_arguments(idl_name, child)
-            elif child_class == 'Type':
-                self.idl_type = type_node_to_type(child)
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-    @classmethod
-    def from_exception_operation_node(cls, idl_name, node):
-        # Needed to handle one case in DOMException.idl:
-        # // Override in a Mozilla compatible format
-        # [NotEnumerable] DOMString toString();
-        # FIXME: can we remove this? replace with a stringifier?
-        operation = cls(idl_name)
-        operation.name = node.GetName()
-        children = node.GetChildren()
-        if len(children) < 1 or len(children) > 2:
-            raise ValueError('ExceptionOperation node with %s children, expected 1 or 2' % len(children))
-
-        type_node = children[0]
-        operation.idl_type = type_node_to_type(type_node)
-
-        if len(children) > 1:
-            ext_attributes_node = children[1]
-            operation.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, ext_attributes_node)
-
-        return operation
-
-    @classmethod
-    def constructor_from_arguments_node(cls, name, idl_name, arguments_node):
-        constructor = cls(idl_name)
-        constructor.name = name
-        constructor.arguments = arguments_node_to_arguments(idl_name, arguments_node)
-        constructor.is_constructor = True
-        return constructor
-
-    def resolve_typedefs(self, typedefs):
-        TypedObject.resolve_typedefs(self, typedefs)
-        for argument in self.arguments:
-            argument.resolve_typedefs(typedefs)
-
-
-################################################################################
-# Arguments
-################################################################################
-
-class IdlArgument(TypedObject):
-    def __init__(self, idl_name, node):
-        self.extended_attributes = {}
-        self.idl_type = None
-        self.is_optional = node.GetProperty('OPTIONAL')  # syntax: (optional T)
-        self.is_variadic = False  # syntax: (T...)
-        self.idl_name = idl_name
-        self.name = node.GetName()
-        self.default_value = None
-
-        children = node.GetChildren()
-        for child in children:
-            child_class = child.GetClass()
-            if child_class == 'Type':
-                self.idl_type = type_node_to_type(child)
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-            elif child_class == 'Argument':
-                child_name = child.GetName()
-                if child_name != '...':
-                    raise ValueError('Unrecognized Argument node; expected "...", got "%s"' % child_name)
-                self.is_variadic = child.GetProperty('ELLIPSIS') or False
-            elif child_class == 'Default':
-                self.default_value = default_node_to_idl_literal(child)
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-
-def arguments_node_to_arguments(idl_name, node):
-    # [Constructor] and [CustomConstructor] without arguments (the bare form)
-    # have None instead of an arguments node, but have the same meaning as using
-    # an empty argument list, [Constructor()], so special-case this.
-    # http://www.w3.org/TR/WebIDL/#Constructor
-    if node is None:
-        return []
-    return [IdlArgument(idl_name, argument_node)
-            for argument_node in node.GetChildren()]
-
-
-################################################################################
-# Stringifiers
-################################################################################
-
-class IdlStringifier(object):
-    def __init__(self, idl_name, node):
-        self.attribute = None
-        self.operation = None
-        self.extended_attributes = {}
-        self.idl_name = idl_name
-
-        for child in node.GetChildren():
-            child_class = child.GetClass()
-            if child_class == 'Attribute':
-                self.attribute = IdlAttribute(idl_name, child)
-            elif child_class == 'Operation':
-                operation = IdlOperation(idl_name, child)
-                if operation.name:
-                    self.operation = operation
-            elif child_class == 'ExtAttributes':
-                self.extended_attributes = ext_attributes_node_to_extended_attributes(idl_name, child)
-            else:
-                raise ValueError('Unrecognized node class: %s' % child_class)
-
-        # Copy the stringifier's extended attributes (such as [Unforgable]) onto
-        # the underlying attribute or operation, if there is one.
-        if self.attribute or self.operation:
-            (self.attribute or self.operation).extended_attributes.update(
-                self.extended_attributes)
-
-
-################################################################################
-# Extended attributes
-################################################################################
-
-def ext_attributes_node_to_extended_attributes(idl_name, node):
-    """
-    Returns:
-      Dictionary of {ExtAttributeName: ExtAttributeValue}.
-      Value is usually a string, with these exceptions:
-      Constructors: value is a list of Arguments nodes, corresponding to
-        possible signatures of the constructor.
-      CustomConstructors: value is a list of Arguments nodes, corresponding to
-        possible signatures of the custom constructor.
-      NamedConstructor: value is a Call node, corresponding to the single
-        signature of the named constructor.
-      SetWrapperReferenceTo: value is an Arguments node.
-    """
-    # Primarily just make a dictionary from the children.
-    # The only complexity is handling various types of constructors:
-    # Constructors and Custom Constructors can have duplicate entries due to
-    # overloading, and thus are stored in temporary lists.
-    # However, Named Constructors cannot be overloaded, and thus do not have
-    # a list.
-    # FIXME: move Constructor logic into separate function, instead of modifying
-    #        extended attributes in-place.
-    constructors = []
-    custom_constructors = []
-    extended_attributes = {}
-
-    def child_node(extended_attribute_node):
-        children = extended_attribute_node.GetChildren()
-        if not children:
-            return None
-        if len(children) > 1:
-            raise ValueError('ExtAttributes node with %s children, expected at most 1' % len(children))
-        return children[0]
-
-    extended_attribute_node_list = node.GetChildren()
-    for extended_attribute_node in extended_attribute_node_list:
-        name = extended_attribute_node.GetName()
-        child = child_node(extended_attribute_node)
-        child_class = child and child.GetClass()
-        if name == 'Constructor':
-            if child_class and child_class != 'Arguments':
-                raise ValueError('Constructor only supports Arguments as child, but has child of class: %s' % child_class)
-            constructors.append(child)
-        elif name == 'CustomConstructor':
-            if child_class and child_class != 'Arguments':
-                raise ValueError('[CustomConstructor] only supports Arguments as child, but has child of class: %s' % child_class)
-            custom_constructors.append(child)
-        elif name == 'NamedConstructor':
-            if child_class and child_class != 'Call':
-                raise ValueError('[NamedConstructor] only supports Call as child, but has child of class: %s' % child_class)
-            extended_attributes[name] = child
-        elif name == 'SetWrapperReferenceTo':
-            if not child:
-                raise ValueError('[SetWrapperReferenceTo] requires a child, but has none.')
-            if child_class != 'Arguments':
-                raise ValueError('[SetWrapperReferenceTo] only supports Arguments as child, but has child of class: %s' % child_class)
-            extended_attributes[name] = arguments_node_to_arguments(idl_name, child)
-        elif child:
-            raise ValueError('ExtAttributes node with unexpected children: %s' % name)
-        else:
-            value = extended_attribute_node.GetProperty('VALUE')
-            extended_attributes[name] = value
-
-    # Store constructors and custom constructors in special list attributes,
-    # which are deleted later. Note plural in key.
-    if constructors:
-        extended_attributes['Constructors'] = constructors
-    if custom_constructors:
-        extended_attributes['CustomConstructors'] = custom_constructors
-
-    return extended_attributes
-
-
-def extended_attributes_to_constructors(idl_name, extended_attributes):
-    """Returns constructors and custom_constructors (lists of IdlOperations).
-
-    Auxiliary function for IdlInterface.__init__.
-    """
-
-    constructor_list = extended_attributes.get('Constructors', [])
-    constructors = [
-        IdlOperation.constructor_from_arguments_node('Constructor', idl_name, arguments_node)
-        for arguments_node in constructor_list]
-
-    custom_constructor_list = extended_attributes.get('CustomConstructors', [])
-    custom_constructors = [
-        IdlOperation.constructor_from_arguments_node('CustomConstructor', idl_name, arguments_node)
-        for arguments_node in custom_constructor_list]
-
-    if 'NamedConstructor' in extended_attributes:
-        # FIXME: support overloaded named constructors, and make homogeneous
-        name = 'NamedConstructor'
-        call_node = extended_attributes['NamedConstructor']
-        extended_attributes['NamedConstructor'] = call_node.GetName()
-        children = call_node.GetChildren()
-        if len(children) != 1:
-            raise ValueError('NamedConstructor node expects 1 child, got %s.' % len(children))
-        arguments_node = children[0]
-        named_constructor = IdlOperation.constructor_from_arguments_node('NamedConstructor', idl_name, arguments_node)
-        # FIXME: should return named_constructor separately; appended for Perl
-        constructors.append(named_constructor)
-
-    return constructors, custom_constructors
-
-
-def clear_constructor_attributes(extended_attributes):
-    # Deletes Constructor*s* (plural), sets Constructor (singular)
-    if 'Constructors' in extended_attributes:
-        del extended_attributes['Constructors']
-        extended_attributes['Constructor'] = None
-    if 'CustomConstructors' in extended_attributes:
-        del extended_attributes['CustomConstructors']
-        extended_attributes['CustomConstructor'] = None
-
-
-################################################################################
-# Types
-################################################################################
-
-def type_node_to_type(node):
-    children = node.GetChildren()
-    if len(children) < 1 or len(children) > 2:
-        raise ValueError('Type node expects 1 or 2 children (type + optional array []), got %s (multi-dimensional arrays are not supported).' % len(children))
-
-    base_type = type_node_inner_to_type(children[0])
-
-    if node.GetProperty('NULLABLE'):
-        base_type = IdlNullableType(base_type)
-
-    if len(children) == 2:
-        array_node = children[1]
-        array_node_class = array_node.GetClass()
-        if array_node_class != 'Array':
-            raise ValueError('Expected Array node as TypeSuffix, got %s node.' % array_node_class)
-        array_type = IdlArrayType(base_type)
-        if array_node.GetProperty('NULLABLE'):
-            return IdlNullableType(array_type)
-        return array_type
-
-    return base_type
-
-
-def type_node_inner_to_type(node):
-    node_class = node.GetClass()
-    # Note Type*r*ef, not Typedef, meaning the type is an identifier, thus
-    # either a typedef shorthand (but not a Typedef declaration itself) or an
-    # interface type. We do not distinguish these, and just use the type name.
-    if node_class in ['PrimitiveType', 'Typeref']:
-        # unrestricted syntax: unrestricted double | unrestricted float
-        is_unrestricted = node.GetProperty('UNRESTRICTED') or False
-        return IdlType(node.GetName(), is_unrestricted=is_unrestricted)
-    elif node_class == 'Any':
-        return IdlType('any')
-    elif node_class == 'Sequence':
-        return sequence_node_to_type(node)
-    elif node_class == 'UnionType':
-        return union_type_node_to_idl_union_type(node)
-    elif node_class == 'Promise':
-        return IdlType('Promise')
-    raise ValueError('Unrecognized node class: %s' % node_class)
-
-
-def sequence_node_to_type(node):
-    children = node.GetChildren()
-    if len(children) != 1:
-        raise ValueError('Sequence node expects exactly 1 child, got %s' % len(children))
-    sequence_child = children[0]
-    sequence_child_class = sequence_child.GetClass()
-    if sequence_child_class != 'Type':
-        raise ValueError('Unrecognized node class: %s' % sequence_child_class)
-    element_type = type_node_to_type(sequence_child)
-    sequence_type = IdlSequenceType(element_type)
-    if node.GetProperty('NULLABLE'):
-        return IdlNullableType(sequence_type)
-    return sequence_type
-
-
-def typedef_node_to_type(node):
-    children = node.GetChildren()
-    if len(children) != 1:
-        raise ValueError('Typedef node with %s children, expected 1' % len(children))
-    child = children[0]
-    child_class = child.GetClass()
-    if child_class != 'Type':
-        raise ValueError('Unrecognized node class: %s' % child_class)
-    return type_node_to_type(child)
-
-
-def union_type_node_to_idl_union_type(node):
-    member_types = [type_node_to_type(member_type_node)
-                    for member_type_node in node.GetChildren()]
-    return IdlUnionType(member_types)